On 06.07.2017 15:51, Marcel Ziswiler wrote:
> On Thu, 2017-07-06 at 13:24 +0300, Dmitry Osipenko wrote:
>> On 06.07.2017 04:24, Peter Chen wrote:
>>> On Wed, Jul 05, 2017 at 08:19:53PM +0300, Dmitry Osipenko wrote:
>>>> From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane
>>>> .org>
>>>>
>>>> Override the compatible string of the first USB controller to
>>>> enable
>>>> device mode.
>>>>
>>>> Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@pub
>>>> lic.gmane.org>
>>>> ---
>>>> arch/arm/boot/dts/tegra20-trimslice.dts | 2 ++
>>>> 1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/arch/arm/boot/dts/tegra20-trimslice.dts
>>>> b/arch/arm/boot/dts/tegra20-trimslice.dts
>>>> index b902ab594afa..96b4f3f9827b 100644
>>>> --- a/arch/arm/boot/dts/tegra20-trimslice.dts
>>>> +++ b/arch/arm/boot/dts/tegra20-trimslice.dts
>>>> @@ -336,7 +336,9 @@
>>>> };
>>>>
>>>> usb@c5000000 {
>>>> + compatible = "nvidia,tegra20-udc";
>>>> status = "okay";
>>>> + dr_mode = "otg";
>>>
>>> If this board supports peripheral-only, you need to
>>> set dr_mode as "peripheral".
>>>
>>
>> It should support OTG, but we aren't going to implement the host mode
>> switch for
>> now. Stephen claims that the host mode is working with the tegra-ehci
>> driver, it
>> would be nice if anyone could confirm this.
>
> I can confirm that on Colibri T20, Apalis/Colibri T30 and Apalis TK1
> host mode works just fine with the regular tegra-ehci driver.
>
Good to know, thank you :)
> I'm about to give your patch set a try on those boards as well and will
> give further feedback.
>
Okay, but we won't be able to switch those boards to the UDC driver until the
peripheral/host mode switching would be implemented. As Stephen pointed, it
would be a user-visible regression.
--
Dmitry
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